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 #include &lt;QtGui&gt;
 #include &lt;QtNetwork&gt;

 #include &quot;dialog.h&quot;

 static const int TotalBytes = 50 * 1024 * 1024;
 static const int PayloadSize = 65536;

 Dialog::Dialog(QWidget *parent)
     : QDialog(parent)
 {
     clientProgressBar = new QProgressBar;
     clientStatusLabel = new QLabel(tr(&quot;Client ready&quot;));
     serverProgressBar = new QProgressBar;
     serverStatusLabel = new QLabel(tr(&quot;Server ready&quot;));

     startButton = new QPushButton(tr(&quot;&amp;Start&quot;));
     quitButton = new QPushButton(tr(&quot;&amp;Quit&quot;));

     buttonBox = new QDialogButtonBox;
     buttonBox-&gt;addButton(startButton, QDialogButtonBox::ActionRole);
     buttonBox-&gt;addButton(quitButton, QDialogButtonBox::RejectRole);

     connect(startButton, SIGNAL(clicked()), this, SLOT(start()));
     connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
     connect(&amp;tcpServer, SIGNAL(newConnection()),
             this, SLOT(acceptConnection()));
     connect(&amp;tcpClient, SIGNAL(connected()), this, SLOT(startTransfer()));
     connect(&amp;tcpClient, SIGNAL(bytesWritten(qint64)),
             this, SLOT(updateClientProgress(qint64)));
     connect(&amp;tcpClient, SIGNAL(error(QAbstractSocket::SocketError)),
             this, SLOT(displayError(QAbstractSocket::SocketError)));

     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout-&gt;addWidget(clientProgressBar);
     mainLayout-&gt;addWidget(clientStatusLabel);
     mainLayout-&gt;addWidget(serverProgressBar);
     mainLayout-&gt;addWidget(serverStatusLabel);
     mainLayout-&gt;addStretch(1);
     mainLayout-&gt;addSpacing(10);
     mainLayout-&gt;addWidget(buttonBox);
     setLayout(mainLayout);

     setWindowTitle(tr(&quot;Loopback&quot;));
 }

 void Dialog::start()
 {
     startButton-&gt;setEnabled(false);

     QApplication::setOverrideCursor(Qt::WaitCursor);

     bytesWritten = 0;
     bytesReceived = 0;

     while (!tcpServer.isListening() &amp;&amp; !tcpServer.listen()) {
         QMessageBox::StandardButton ret = QMessageBox::critical(this,
                                         tr(&quot;Loopback&quot;),
                                         tr(&quot;Unable to start the test: %1.&quot;)
                                         .arg(tcpServer.errorString()),
                                         QMessageBox::Retry
                                         | QMessageBox::Cancel);
         if (ret == QMessageBox::Cancel)
             return;
     }

     serverStatusLabel-&gt;setText(tr(&quot;Listening&quot;));
     clientStatusLabel-&gt;setText(tr(&quot;Connecting&quot;));
     tcpClient.connectToHost(QHostAddress::LocalHost, tcpServer.serverPort());
 }

 void Dialog::acceptConnection()
 {
     tcpServerConnection = tcpServer.nextPendingConnection();
     connect(tcpServerConnection, SIGNAL(readyRead()),
             this, SLOT(updateServerProgress()));
     connect(tcpServerConnection, SIGNAL(error(QAbstractSocket::SocketError)),
             this, SLOT(displayError(QAbstractSocket::SocketError)));

     serverStatusLabel-&gt;setText(tr(&quot;Accepted connection&quot;));
     tcpServer.close();
 }

 void Dialog::startTransfer()
 {
     bytesToWrite = TotalBytes - (int)tcpClient.write(QByteArray(PayloadSize, '@'));
     clientStatusLabel-&gt;setText(tr(&quot;Connected&quot;));
 }

 void Dialog::updateServerProgress()
 {
     bytesReceived += (int)tcpServerConnection-&gt;bytesAvailable();
     tcpServerConnection-&gt;readAll();

     serverProgressBar-&gt;setMaximum(TotalBytes);
     serverProgressBar-&gt;setValue(bytesReceived);
     serverStatusLabel-&gt;setText(tr(&quot;Received %1MB&quot;)
                                .arg(bytesReceived / (1024 * 1024)));

     if (bytesReceived == TotalBytes) {
         tcpServerConnection-&gt;close();
         startButton-&gt;setEnabled(true);
         QApplication::restoreOverrideCursor();
     }
 }

 void Dialog::updateClientProgress(qint64 numBytes)
 {
     bytesWritten += (int)numBytes;
     if (bytesToWrite &gt; 0)
         bytesToWrite -= (int)tcpClient.write(QByteArray(qMin(bytesToWrite, PayloadSize), '@'));

     clientProgressBar-&gt;setMaximum(TotalBytes);
     clientProgressBar-&gt;setValue(bytesWritten);
     clientStatusLabel-&gt;setText(tr(&quot;Sent %1MB&quot;)
                                .arg(bytesWritten / (1024 * 1024)));
 }

 void Dialog::displayError(QAbstractSocket::SocketError socketError)
 {
     if (socketError == QTcpSocket::RemoteHostClosedError)
         return;

     QMessageBox::information(this, tr(&quot;Network error&quot;),
                              tr(&quot;The following error occurred: %1.&quot;)
                              .arg(tcpClient.errorString()));

     tcpClient.close();
     tcpServer.close();
     clientProgressBar-&gt;reset();
     serverProgressBar-&gt;reset();
     clientStatusLabel-&gt;setText(tr(&quot;Client ready&quot;));
     serverStatusLabel-&gt;setText(tr(&quot;Server ready&quot;));
     startButton-&gt;setEnabled(true);
     QApplication::restoreOverrideCursor();
 }</pre>
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